I only have 640 x 480 resolution - Dell Latitude D400 Notebook

, clicking Control Panel, and then, under Appearance and Personalization, clickingAdjust screen resolution. Click the drop-down list next to Resolution, move the slider to the resolution you want, and then click Apply. Click Keep to use the newresolution, or click Revert to go back to the previous resolution.

Change your screen resolution - Windows Help - Microsoft Support

https://support.microsoft.com/en-gb/help/14108/windows-7-change-screen-resolution How to fix screen resolution Google Search

• Native Resolution - 1280 x 1024 at 75 Hz

• To change your screen resolution

• Open Screen Resolution by clicking the Start button , clicking Control Panel, and then, under Appearance and Personalization, clicking Adjust screen resolution.
• Click the drop-down list next to Resolution, move the slider to the resolution you want, and then click Apply.
• Click Keep to use the new resolution, or click Revert to go back to the previous resolution.
• if not display come pls select esc button to revert resolution.(don't press Enter)

1. Open Screen Resolution by swiping in from the right edge of the screen, tapping Search (or if you're using a mouse, pointing to the upper-right corner of the screen, moving the mouse pointer down, and then clicking Search), entering Display in the search box, tapping or clicking Settings, and then tapping or clicking Display.
   

2. Tap or click Adjust resolution.
   

3. Tap or click the Resolution list and find the resolution marked (Recommended). This is your monitor's native resolution-usually the highest resolution your monitor can support.
   

Screen Resolution in Control Panel shows the recommended resolution for your monitor.

Monitors can support resolutions that are lower than their native resolutions, but text won't look as sharp and the display might be small, centered on the screen, edged with black, or stretched.

To change your screen resolution

1. Open Screen Resolution by clicking the Start button , clicking Control Panel, and then, under Appearance and Personalization, clicking Adjust screen resolution.
   

2. Click the drop-down list next to Resolution, move the slider to the resolution you want, and then click Apply.
   

3. Click Keep to use the new resolution, or click Revert to go back to the previous resolution.
   

Screen Resolution in Control Panel shows the recommended resolution for your monitor.

IT IS NOT HARDWARE PROBLEM
Change screen resolution

Screen resolution refers to the clarity of the text and images on your screen. At higher resolutions, items appear sharper. They also appear smaller, so more items fit on the screen. At lower resolutions, fewer items fit on the screen, but they are larger and easier to see. At very low resolutions, however, images might have jagged edges.

For example, 640 × 480 is a lower screen resolution, and 1600 × 1200 is a higher one. CRT monitors generally display a resolution of 800 × 600 or 1024 × 768. LCD monitors can better support the higher resolutions. Whether you can increase your screen resolution depends on the size and capability of your monitor and the type of video card you have.

Text and images are sharper and smaller at high screen resolutions

Text is larger and easier to read at low screen resolutions, but images are blocky and fewer items fit on the screen

1. Open Display Settings by clicking the Start button , clicking Control Panel, clicking Appearance and Personalization, clicking Personalization, and then clicking Display Settings.
   

2. Under Resolution, move the slider to the resolution you want, and then click Apply.
   

First of all press F8 key several times before window boots and then select last known good configuration otherwise go in safemode and then set the screen resolution to minimum.

Various ways....Try these! the slow problem wil get off

How to change the resolution (Windows)
The precision of printouts can be improved by changing scanning resolution.
The higher the scanning resolution is, the more precise the scanned images are represented, however, the file size gets larger.
The scanning resolution can be changed before scanning photos.
Note: When the scanning resolution is doubled, the image data size will be quadrupled.
When the data size is large, the throughput speed may slow down or may occupy too much of the computer's resources (memory).

<Procedures>
Memo: The following is explained using MP Navigator 3.0 procedures.
To scan using MP Navigator:
1. Launch MP Navigator and click Photos/Documents (Platen) on the Scan/Import tab.
- The window you see varies according to the printer model.
2. When the Photos/Documents (Platen) window is displayed, click Specify.

3. When the Scan Settings window is displayed, select the resolution in Scanning Resolution.
If necessary, set other items as well.

4. Click OK.
5. In the Photos/Documents (Platen) window, click Scan to start scanning.
6. Changing the resolution is completed.


To scan using the scanner driver:
1. Launch MP Navigator and click Open Scanner Driver on the Scan/Import tab.
- The window you see varies according to the printer model.
2. Change the resolution.
According to your purpose, set the resolution in Simple Mode with ease, or in Advanced Mode with a detailed setting.
- To set the resolution in Simple Mode:
(1) Select the Simple Mode tab.
(2) Select the output resolution from the Destination pulldown menu.
If necessary, set other items.

- To set the resolution in Advanced Mode:
(1) Select the Advanced Mode tab.
(2) In Output Resolution, select one of the preset resolution, or enter the number from 25 to 19200 to specify your favorite resolution.
If necessary, set other items.

3. Click Scan to start scanning.
4. Changing the resolution is completed.

It depends upon the notebook you use if it support the resoulution you want. You can change the resolution by display properties in control panel. Also 1280*800 is used only by widescreen desktop or laptops.